Neutron diffusion measurements in water from 18 to 280$deg$C

Abstract

The pulsed-neutron method has been used to measure the temperature dependence of both the diffusion constant and the extrapolated end point in water. The measured temperature dependence of the diffusion constant was found to be in good agreement with the theoretical values predicted by the Nelkin kernel.Measurements of the extrapolated end point in a cylinder of diameter 7 in. and height 7 in. gave a value of 0·323 ± 0·013 cm, with a similar result for a 7 in. cubical system. For an 8 in. diameter cylinder 4 in. high, however, the value was 0·465 ± 0·039 cm, a change which would not be expected theoretically. The extrapolated end point was also measured at temperatures up to 250°C. For a 4 in. high cylinder no definite temperature dependence was observed, but in a 16 in. high cylinder there was an increase with temperature from 0·340 ± 0·030 cm at 18°C to 0·469 ± 0·021 cm at 250°C.

Comments on the paper `Neutron diffusion measurements in water from 18 to 280$deg$ C'

“…In a recent article in this journal (Bowen and Scott 1969) measurements have been reported on neutron diffusion parameters in light water from 20 to 280 OC. It is the purpose of this letter to draw attention to several points in this article that may give rise to confusion for subsequent workers in the field.…”

Vignettes of Computer-based Museum Interactive and Games Software through the Years

“…In parallel, I worked on multidimensional hypercubes in BASIC on a Research Machines microcomputer (Bowen 1982) and the C programming language on a Silicon Graphics workstation (Bowen 1984). I also produced a BASIC geometrical plotting library of subroutines (Bowen 1983) and 3D wireframe software (Bowen 1984b;1984c).…”